Let’s explore “Testosterone, free — lab reference”

Mayo example age 20-24: M 5.25-20.7; F <0.13-1.08. Declines with age and is method-dependent.

Often used when total PSA is in an indeterminate zone. Ask your clinician to use the performing-lab risk table.

Binding abnormalities and severe illness may affect some free-hormone assays.

Useful in selected hyperthyroid states; not a sensitive stand-alone test for hypothyroidism.

Morning collection preferred for men. Method and age matter; confirm unexpected low values.

Depends on total testosterone, SHBG, albumin, calculation, and assay.

How you sit or lie down for the sample, and stress during collection, can affect this result. Use the cutoff from the lab that ran your test.

Ask your clinician to read this result with testosterone or estradiol, FSH, cycle phase, and pituitary context.

Ask your clinician to read this result with age, ovarian status, testosterone/estradiol, and pituitary context.

No single normal cutoff fits every patient. Ask your clinician to use age, baseline, trend, prostate size, risk factors, and shared decision-making.

Method-specific. Clarify its role in hair, prostate, androgen therapy, or enzyme questions.

May assist selected fertility evaluations; not a routine wellness marker.